JP6468667B2 - Terminal apparatus, base station apparatus, usage architecture determination method, and computer program - Google Patents

Description

  The present invention relates to a terminal device, a base station device, a usage architecture determination method, and a computer program.

  A cellular network system called LTE (Long Term Evolution) standardized by a standardization organization “3GPP (3rd Generation Partnership Project)” (hereinafter referred to as LTE system) is known. FIG. 10 is a conceptual diagram illustrating a configuration example of the LTE system. In FIG. 10, each base station apparatus (E-UTRAN NodeB) eNB_m provides a cell Cell_m. Each adjacent cell Cell_m is partially overlapped. Each base station apparatus eNB_m is connected to a communication apparatus S-GW called a serving gateway. The terminal equipment (user equipment) UE is connected to one base station apparatus eNB_m. The communication device S-GW establishes a communication link with the terminal device UE via the base station device eNB_m. A communication link established by the communication device S-GW with the terminal device UE via the base station device eNB_m is referred to as a bearer here. The communication device S-GW serves as an anchor point (a point for performing communication path switching) when the terminal device UE changes the connection destination base station device eNB_m. The change of the connection destination base station device eNB_m by the terminal device UE is referred to as “hand over” or “hand off”.

  FIG. 11 is a conceptual diagram illustrating another configuration example of the LTE system. In FIG. 11, a base station apparatus eNB_s is further provided for the LTE system of FIG. Each base station apparatus eNB_s is connected to the communication apparatus S-GW. Each base station apparatus eNB_s provides a cell Cell_s. The cell Cell_s has narrower coverage than the cell Cell_m. The cell Cell_s is overlapped with the cell Cell_m. In the future, introduction of the LTE system of FIG. 11 is under consideration due to the use of a high frequency band and the necessity of accommodating many terminal apparatuses UE. Hereinafter, when the base station apparatus eNB_m and the base station apparatus eNB_s are not particularly distinguished, they are referred to as “base station apparatus eNB”.

  In 3GPP, when the communication device S-GW establishes a bearer with the terminal device UE via the base station device eNB, while leaving some bearers in a certain base station device eNB, An architecture for establishing a bearer with a terminal device UE via another base station device eNB has been studied (for example, see Non-Patent Document 1). 12 and 13 are conceptual diagrams showing examples of the architecture.

[Architecture 1A (see FIG. 12)]
FIG. 12 shows an architecture called “1A”. The architecture 1A is a configuration in which bearers are established between the communication device S-GW and the terminal device UE via different base station devices eNB. In FIG. 12, a bearer Br1 is established between the communication device S-GW and the terminal device UE via the base station device eNB (a). Further, a bearer Br2 is established between the communication device S-GW and the terminal device UE via the base station device eNB (b). In this architecture 1A, when viewed in units of bearers, the communication device S-GW and the base station device eNB, or between the base station device eNB and the terminal device UE can be regarded as a normal communication path. The communication device S-GW and the terminal device UE communicate with each other through different communication paths for each bearer.

[Architecture 3C (see FIG. 13)]
FIG. 13 shows an architecture called “3C”. In the architecture 3C, there is one communication path between the communication device S-GW and the base station device eNB, and one of the bearers passing through the base station device eNB is between the base station device eNB and the terminal device UE. A part of the bearers is divided into a plurality of base station apparatuses eNB, and a part of the divided bearers reaches the terminal apparatus UE via another base station apparatus eNB. In FIG. 13, a bearer Br3 that passes through the base station device eNB (a) is established between the communication device S-GW and the terminal device UE. This bearer Br3 is not divided. Also, a bearer Br4 that passes through the base station device eNB (a) is established between the communication device S-GW and the terminal device UE. This bearer Br4 is divided into bearers Br4 (a) and (b) by the base station apparatus eNB (a). The bearer Br4 (a) directly reaches the terminal device UE from the base station device eNB (a). On the other hand, the bearer Br4 (b) reaches the terminal device UE from the base station device eNB (a) via the base station device eNB (b). Traffic transfer between the base station apparatuses eNB (a) and (b) is performed using a logical line called an X2 line.

  Establishing a bearer with the communication device S-GW via the plurality of base station devices eNB as in the architectures 1A and 3C described above is referred to as dual connectivity. In addition, in the state where dual connectivity is performed, a base station device eNB that leaves a bearer carrying control information is called a master base station device (MeNB (Master E-UTRAN NodeB)), and a destination to which some bearers are moved This base station apparatus eNB is called a secondary base station apparatus (SeNB (Secondary E-UTRAN NodeB)).

3GPP, TR 36.842, “Study on Small Cell enhancements for E-UTRA and E-UTRAN; Higher layer aspects”, V12.0.0, 2013-12

  According to the above-described architectures 1A and 3C, for example, while leaving some bearers, such as bearers carrying control information, in a certain base station apparatus eNB, other bearers pass through the other base station apparatus eNB to the terminal apparatus UE. Can be established between. For example, as illustrated in FIG. 11, when a large number of base station apparatuses eNB_s with narrow coverage are arranged, the number of handovers that occurs due to movement of the terminal apparatus UE increases, and as a result, the amount of control information that flows in the LTE system There is a concern that data traffic exchange by the terminal device UE will be compressed. As one of the countermeasures, the architectures 1A and 3C can be considered.

  However, the conventional LTE system does not consider using both architectures 1A and 3C in the same system. For example, when the supported (usable) architecture is different depending on each terminal apparatus UE, when trying to implement dual connectivity, the base station apparatus eNB knows the architecture supported by the terminal apparatus UE connected to itself. There is a need. However, in the conventional LTE system, the base station apparatus eNB cannot know the architecture supported by the terminal apparatus UE connected to itself.

  Moreover, in the architecture 3C, since the bearer divided | segmented by the base station apparatus eNB can use the radio | wireless resource between the some base station apparatus eNB and the terminal device UE, the peak throughput per bearer is reduced. It can be improved. On the other hand, since a part of the traffic of the bearer that reaches a certain base station apparatus eNB reaches the terminal apparatus UE via another base station apparatus eNB, in general, the communication apparatus S-GW and the terminal apparatus UE It can be considered that the delay time between the two increases. Depending on the characteristics of each architecture, there is an issue of properly using the architecture.

  The present invention has been made in view of such circumstances, and a terminal device, a base station device, and a use that can contribute to performing dual connectivity when there are a plurality of terminal devices each supporting different architectures It is an object to provide an architecture determination method and a computer program.

(1) A terminal apparatus according to the present invention is a terminal apparatus that establishes a communication link with a communication apparatus via a base station apparatus, and performs other communication while leaving the communication link in one base station apparatus. Of the plurality of architectures that establish a link with the terminal device via another base station device, a wireless communication unit that transmits support architecture information indicating the architecture supported by the terminal device to the base station device, The wireless communication unit can transmit usable information of an architecture indicating that the terminal device can use a plurality of the architectures simultaneously to the base station device.
(2) The terminal device according to the present invention is the terminal device according to (1), wherein the support architecture information or the usable information on the architecture is transmitted from the terminal device in response to an inquiry from the base station device. The information is transmitted in addition to the information on the capability or the information indicating the correspondence status of the terminal device with respect to the function of the wireless communication system.

(3) A base station apparatus according to the present invention is a base station apparatus that relays a communication link established between a communication apparatus and a terminal apparatus, while leaving the communication link in one base station apparatus, A wireless communication unit that receives support architecture information indicating an architecture supported by the terminal device from among the plurality of architectures that establish communication links with the terminal device via other base station devices; A control unit that determines a usable architecture based on the support architecture information received from the terminal device and the support architecture information indicating the architecture supported by the base station device, the wireless communication unit, The architecture availability information indicating that the terminal device can use a plurality of the architectures at the same time. The control unit receives an architecture that can be used based on the support architecture information received from the terminal device, the usable information of the architecture, and the support architecture information indicating the architecture supported by the base station device. It is characterized by determining.

(4) A usage architecture determination method according to the present invention is a usage architecture determination method of a terminal apparatus that establishes a communication link with a communication apparatus via a base station apparatus, and the terminal apparatus Architecture information indicating an architecture supported by the terminal device among a plurality of architectures established with the terminal device via another base station device while remaining in the base station device To the base station apparatus, the terminal apparatus transmitting to the base station apparatus architecture usable information indicating that the terminal apparatus can use a plurality of the architectures simultaneously, and the base station apparatus, Support architecture information received from the terminal device, usable information on the architecture, and own base station device Characterized in that it comprises the steps of determining the available architectures based on the support architecture information indicating the architecture supporting the.

(5) A computer program according to the present invention allows a computer of a terminal device that establishes a communication link with a communication device via a base station device, while leaving the communication link in one base station device A step of transmitting support architecture information indicating an architecture supported by the own terminal device among a plurality of architectures established with the terminal device via another base station device to the base station device; Transmitting a usable information of an architecture indicating that the terminal device can use a plurality of the architectures simultaneously to the base station device.

  According to the present invention, it is possible to contribute to performing dual connectivity when there are a plurality of terminal devices that support different architectures.

It is a block diagram which shows the structure of the base station apparatus eNB which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the terminal device UE which concerns on one Embodiment of this invention. It is a sequence chart which shows the procedure of the architecture information acquisition method which concerns on 1st Embodiment of this invention. It is a sequence chart which shows the procedure of the architecture information acquisition method which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the procedure of the usage architecture determination method which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the procedure of the usage architecture determination method which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the procedure of the usage architecture determination method which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the procedure of the usage architecture determination method which concerns on 3rd Embodiment of this invention. It is a flowchart which shows the procedure of the usage architecture determination method which concerns on 3rd Embodiment of this invention. It is a conceptual diagram which shows the example of 1 structure of a LTE system. It is a conceptual diagram which shows the other structural example of a LTE system. It is a conceptual diagram which shows the architecture 1A. It is a conceptual diagram which shows the architecture 3C.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, an LTE system will be described as an example of a wireless communication system.

[First Embodiment]
First, a first embodiment will be described as an embodiment according to the present invention.
FIG. 1 is a block diagram showing a configuration of a base station apparatus eNB according to an embodiment of the present invention. In FIG. 1, the base station apparatus eNB includes a radio communication unit 11, a communication unit 12, a control unit 13, and a storage unit 14. The wireless communication unit 11, the communication unit 12, the control unit 13, and the storage unit 14 are connected so that data can be transmitted and received between them. The radio communication unit 11 performs radio communication with the terminal device UE. The communication unit 12 communicates with other devices via the backbone network. The communication unit 12 communicates with the communication device S-GW, for example. The control unit 13 controls operations related to the base station apparatus eNB. The storage unit 14 stores data.

  The storage unit 14 includes support architecture information 141, base station architecture information 142, and terminal architecture information 143. The support architecture information 141 indicates the architecture supported by the own base station apparatus eNB. In the LTE system according to the present embodiment, two architectures 1A (see FIG. 12) and 3C (see FIG. 13) are used in combination. Therefore, the support architecture information 141 indicates which architecture (1A or 3C, or both 1A and 3C) of the architectures 1A and 3C is supported by the own base station apparatus eNB.

  The base station architecture information 142 indicates an architecture supported by another base station apparatus eNB. Specifically, it shows which architecture (1A or 3C or both 1A and 3C) is supported by the other base station apparatus eNB among the architectures 1A and 3C.

  The terminal architecture information 143 indicates the architecture supported by the terminal device UE. Specifically, it indicates which architecture (1A or 3C, or both 1A and 3C) of the architectures 1A and 3C is supported by the terminal apparatus UE.

  FIG. 2 is a block diagram showing a configuration of the terminal apparatus UE according to an embodiment of the present invention. In FIG. 2, the terminal device UE includes a radio communication unit 21, a control unit 22, a storage unit 23, an input unit 24, and an output unit 25. The wireless communication unit 21, the control unit 22, the storage unit 23, the input unit 24, and the output unit 25 are connected so that data can be transmitted and received between them. The wireless communication unit 21 communicates with other devices via the base station device eNB that is wirelessly connected.

  The control unit 22 controls operations related to the terminal device UE. The storage unit 23 stores data. The input unit 24 inputs data. The output unit 25 outputs data. Examples of the input unit 24 include an input device such as a keyboard, a numeric keypad, and a mouse, a microphone for inputting sound, and a receiving device for short-range wireless communication. Examples of the output unit 25 include a display device such as a liquid crystal display device, a speaker that outputs sound, and a transmission device for short-range wireless communication. Moreover, you may provide the touchscreen which has the function of both an input device and a display device. Examples of the terminal device UE include a mobile communication terminal device such as a smartphone or a tablet computer (tablet PC).

  The storage unit 23 includes support architecture information 231. The support architecture information 231 indicates an architecture supported by the terminal device UE. Specifically, it shows which architecture (1A or 3C, or both 1A and 3C) of the architectures 1A and 3C the own terminal apparatus UE supports.

  Next, operations according to the first embodiment will be described with reference to FIG. FIG. 3 is a sequence chart showing the procedure of the architecture information acquisition method according to the first embodiment of the present invention.

  In this embodiment, a terminal device capability inquiry procedure is used. When the terminal apparatus UE starts connection to the base station apparatus eNB, the base station apparatus eNB knows what function the terminal apparatus UE supports, and sets the corresponding settings and communication instructions accordingly. There is a need to transmit to the device UE. For this reason, the base station apparatus eNB inquires of the terminal apparatus UE about information related to the function supported by the terminal apparatus UE (information on terminal capability (user equipment capability)). When receiving the inquiry about the terminal capability from the base station device eNB, the terminal device UE notifies the base station device eNB of its own terminal capability.

(Step S1) The control unit 13 of the base station apparatus eNB transmits a terminal capability inquiry message to the terminal apparatus UE by the radio communication unit 11.

(Step S <b> 2) The control unit 13 of the terminal device UE stores information on the terminal capability of the terminal device UE and further stores it in the storage unit 23 by the wireless communication unit 21 in response to the inquiry of the terminal capability from the base station device eNB Support architecture information 231 (information indicating the architecture supported by the terminal apparatus UE) is transmitted to the base station apparatus eNB.

  The control unit 13 of the base station apparatus eNB receives the support architecture information (information indicating the architecture supported by the terminal apparatus UE) received by the response from the terminal apparatus UE in response to the terminal capability inquiry, and the terminal architecture information 143 of the terminal apparatus UE. Is stored in the storage unit 14.

[Second Embodiment]
Next, a second embodiment will be described as an embodiment according to the present invention. The configuration of the base station apparatus eNB is the same as that of FIG. 1 according to the first embodiment. The configuration of the terminal device UE is the same as that of FIG. 2 according to the first embodiment.

  FIG. 4 is a sequence chart showing the procedure of the architecture information acquisition method according to the second embodiment of the present invention. The operation according to the second embodiment will be described with reference to FIG. In the architecture information acquisition method according to the second embodiment, the capability inquiry procedure of the terminal device is used as in the first embodiment.

(Step S11) The control unit 13 of the base station apparatus eNB transmits a terminal capability inquiry message to the terminal apparatus UE by the wireless communication unit 11.

(Step S12) The control unit 13 of the terminal device UE uses the radio communication unit 21 to receive information on the terminal capability of the terminal device UE and simultaneously use a plurality of architectures in response to an inquiry about the terminal capability from the base station device eNB. The propriety information is transmitted to the base station apparatus eNB. Information on availability of simultaneous use of a plurality of architectures is included in the support architecture information 231 stored in the storage unit 23. At this time, the support architecture information 231 (information indicating the architecture supported by the terminal device UE and information on the simultaneous use of a plurality of architectures) may be transmitted to the base station device eNB.

  The simultaneous availability information of multiple architectures indicates whether or not the terminal device UE can use multiple architectures (both architectures 1A and 3C in the present embodiment) at the same time. Whether or not both of the architectures 1A and 3C can be used simultaneously is set in advance in the support architecture information 231 depending on the specifications of the hardware of the terminal device UE.

  The control unit 13 of the base station apparatus eNB stores, in the storage unit 14, the simultaneous use availability information of multiple architectures received as a response from the terminal apparatus UE in response to the terminal capability inquiry as the terminal architecture information 143 of the terminal apparatus UE. At this time, when the support architecture information (information indicating the architecture supported by the terminal device UE and information on the simultaneous use of a plurality of architectures) is received from the terminal device UE, the support architecture information (support of the terminal device UE) Information indicating the architecture to be used and information on whether or not multiple architectures can be used simultaneously are stored in the storage unit 14 as the terminal architecture information 143 of the terminal apparatus UE.

  Next, with reference to FIG.5, FIG.6, FIG.7, the operation | movement which concerns on the use architecture determination of the control part 13 of the base station apparatus eNB is demonstrated. 5, 6, and 7 are flowcharts showing the procedure of the architecture used determination method according to the second embodiment of the present invention. In FIG.5, FIG.6, FIG.7, the own base station apparatus eNB is described as the base station apparatus X, and in the description based on FIG.5, FIG.6, and FIG. This is referred to as base station apparatus X. Moreover, the target base station apparatus eNB refers to the partner base station apparatus eNB that performs dual connectivity together with the base station apparatus X. The bearer Y refers to a bearer that is newly established between the terminal device UE and the communication device S-GW and that passes through the base station device X.

(Step S <b> 101) The control unit 13 reads the support architecture information 141 of the base station apparatus X from the storage unit 14.

(Step S <b> 102) The control unit 13 determines whether there are a plurality of architectures indicated by the read support architecture information 141. If there are a plurality of determination results, the process proceeds to step S103, and if there is only one, the process proceeds to step S113 in FIG.

(Step S103) The control unit 13 determines whether there are a plurality of architectures indicated by the base station architecture information 142 of the target base station apparatus eNB in the storage unit 14. If there are a plurality of determination results, the process proceeds to step S104 in FIG. 6 and if there is only one, the process proceeds to step S114 in FIG.

(Step S104) The control unit 13 determines whether or not the maximum transmission rate of the X2 line between the base station apparatus X and the target base station apparatus eNB is equal to or greater than a predetermined threshold. As a result of the determination, if it is equal to or greater than the threshold, the process proceeds to step S105, and if it is less than the threshold, the process proceeds to step S111.

  Information indicating the maximum transmission rate of the X2 line between the base station apparatus X and the target base station apparatus eNB is stored in the storage unit 14 in advance. For example, after the X2 line is established, the control unit 13 acquires X2 line maximum transmission rate information indicating how much data can be transmitted at the maximum through the X2 line by measurement of the communication unit 12. Then, the control unit 13 stores the acquired X2 line maximum transmission rate information in the storage unit 14.

(Step S105) The control unit 13 determines whether or not the storage unit 14 has only one architecture indicated by the terminal architecture information 143 of the terminal device UE. As a result of the determination, if there is only one, the process proceeds to step S106, and if there is a plurality, the process proceeds to step S107.

(Step S106) The architecture used by the control unit 13 for the bearer Y of the terminal device UE is the only architecture supported by the terminal device UE. This is because both the base station apparatus X and the target base station apparatus eNB support both architectures 1A and 3C, and the maximum transmission rate of the X2 line between these base station apparatuses is equal to or greater than a predetermined threshold value. This is because the terminal device UE supports only one architecture.

(Step S107) The control unit 13 determines whether or not the simultaneous use availability information of multiple architectures included in the terminal architecture information 143 of the terminal device UE in the storage unit 14 is the simultaneous use of multiple architectures. As a result of the determination, if multiple architectures can be used simultaneously, the process proceeds to step S108, and if multiple architectures are not used simultaneously, the process proceeds to step S109.

(Step S108) The architecture used for the bearer Y of the terminal device UE by the control unit 13 is an architecture based on QoS (Quality of Service) requested by the bearer Y. This is because the base station apparatus X, the target base station apparatus eNB, and the terminal apparatus UE all support both architectures 1A and 3C, and the maximum transmission rate of the X2 line between these base station apparatuses is a predetermined threshold value. This is because the terminal apparatus UE can use both the architectures 1A and 3C at the same time, or the terminal apparatus UE has not yet performed dual connectivity (see step S109 described later). That is, either of the architectures 1A and 3C may be used according to the QoS requested by the bearer Y.

  For example, if the delay time required by the bearer Y is less than a certain threshold value, the architecture 1A is used, and the architecture 3C is used otherwise. As another example, if the transmission rate required by the bearer Y is less than a certain threshold, the architecture 1A is used, and if not, the architecture 3C is used.

(Step S109) The control unit 13 determines whether or not the terminal device UE has already established another bearer before the bearer Y and has performed dual connectivity. As a result of the determination, if another bearer has already been established and dual connectivity is being performed, the process proceeds to step S110, and if not, the process proceeds to step S108.

(Step S110) The architecture used for the bearer Y of the terminal device UE by the control unit 13 is assumed to be an architecture already used by another bearer in the terminal device UE. This is because the base station apparatus X, the target base station apparatus eNB, and the terminal apparatus UE all support both architectures 1A and 3C, and the maximum transmission rate of the X2 line between these base station apparatuses is a predetermined threshold value. This is because the terminal apparatus UE cannot use both the architectures 1A and 3C at the same time, and the terminal apparatus UE has already performed dual connectivity using either architecture.

(Step S111) The control unit 13 determines whether or not the terminal architecture information 143 of the terminal device UE indicates that the architecture 1A is supported in the storage unit 14. As a result of the determination, if the terminal apparatus UE supports the architecture 1A, the process proceeds to step S112. If the terminal apparatus UE does not support the architecture 1A, the process proceeds to step S117 in FIG.

(Step S112) The architecture that the control unit 13 uses for the bearer Y of the terminal device UE is assumed to be architecture 1A. This is because both the base station apparatus X and the target base station apparatus eNB support both the architectures 1A and 3C, and the maximum transmission rate of the X2 line between these base station apparatuses is less than a predetermined threshold. This is because the terminal apparatus UE supports the architecture 1A.

(Step S113) The control unit 13 has only one of the architectures indicated by the base station architecture information 142 of the target base station apparatus eNB in the storage unit 14 and the support architecture information 141 read from the storage unit 14 in Step S101. It is determined whether or not the architecture is equal. As a result of this determination, if they are equal, the process proceeds to step S114, and if not, the process proceeds to step S117.

(Step S114) The control unit 13 determines whether or not the architecture supported in common between the base station apparatus X and the target base station apparatus eNB is the architecture 1A. If it is determined that the architecture is 1A, the process proceeds to step S115. If the architecture is not 1A, the process proceeds to step S118.

(Step S115) The control unit 13 determines whether or not the terminal architecture information 143 of the terminal device UE indicates that the architecture 1A is supported in the storage unit 14. As a result of the determination, if the terminal apparatus UE supports the architecture 1A, the process proceeds to step S116, and if the terminal apparatus UE does not support the architecture 1A, the process proceeds to step S117.

(Step S116) The control unit 13 is configured to support the architecture used for the bearer Y of the terminal device UE in common between the base station device X and the target base station device eNB. This is because there is only one architecture that is commonly supported by the base station apparatus X and the target base station apparatus eNB, and the maximum transmission rate of the X2 line between these base station apparatuses is greater than or equal to a predetermined threshold (steps described later). This is because the terminal device UE supports an architecture that is commonly supported by the base station device X and the target base station device eNB (see step S119 described later).

(Step S117) The control part 13 determines not performing dual connectivity with respect to the bearer Y of the terminal device UE. This is because there is no architecture that the base station apparatus X and the target base station apparatus eNB support in common, or there is only one architecture 3C that the base station apparatus X and the target base station apparatus eNB support in common. The maximum transmission rate of the X2 line between these base station apparatuses is less than a predetermined threshold (see step S118 described later), or the terminal apparatus UE supports only the base station apparatus X and the target base station apparatus eNB in common This is because one architecture is not supported (see step S119 described later).

(Step S118) The control unit 13 determines whether or not the maximum transmission rate of the X2 line between the base station apparatus X and the target base station apparatus eNB is equal to or greater than a predetermined threshold value. As a result of the determination, if it is equal to or greater than the threshold value, the process proceeds to step S119, and if it is less than the threshold value, the process proceeds to step S117.

(Step S119) The control unit 13 determines whether or not the terminal architecture information 143 of the terminal device UE indicates that the architecture 3C is supported in the storage unit 14. As a result of the determination, if the terminal apparatus UE supports the architecture 3C, the process proceeds to step S116. If the terminal apparatus UE does not support the architecture 3C, the process proceeds to step S117.

[Third Embodiment]
Next, a third embodiment will be described as an embodiment according to the present invention. The configuration of the base station apparatus eNB is the same as that of FIG. 1 according to the first embodiment. The configuration of the terminal device UE is the same as that of FIG. 2 according to the first embodiment.

  In the third embodiment, the base station apparatus eNB notifies the terminal apparatus UE of the architecture (support architecture information 141) that it supports. The terminal device UE stores the support architecture information notified from the base station device eNB in the storage unit 23. Then, the terminal apparatus UE determines a usable architecture based on the architecture supported by the base station apparatus eNB and the architecture supported by the terminal apparatus eNB (supported architecture information 231), and the determined usable architecture is determined by the base station apparatus. Notify eNB.

  With reference to FIG. 8, FIG. 9, the operation | movement which concerns on the use architecture determination of the control part 22 of the terminal device UE is demonstrated. 8 and 9 are flowcharts showing the procedure of the usage architecture determination method according to the third embodiment of the present invention. 8 and 9, the own terminal apparatus UE is described as a terminal apparatus X, and in the following description of FIGS. 8 and 9, the own terminal apparatus UE is referred to as a terminal apparatus X.

(Step S <b> 201) The control unit 22 reads the support architecture information 231 of the terminal device X from the storage unit 23.

(Step S202) The control unit 22 determines whether there are a plurality of architectures indicated by the read support architecture information 231. As a result of the determination, if there are a plurality, the process proceeds to step S203, and if there is only one, the process proceeds to step S206 in FIG.

(Step S203) The control unit 22 determines whether there is a plurality of architectures indicated by the support architecture information (architecture information supported by the base station apparatus eNB) notified from the base station apparatus eNB to which the terminal apparatus X is connected. To do. As a result of the determination, if there are a plurality, the process proceeds to step S204.

(Step S204) The control unit 22 determines usable architectures for both the architectures 1A and 3C. This is because both the terminal device X and the base station device eNB to which the terminal device X is connected support both architectures 1A and 3C. The control unit 22 uses the wireless communication unit 21 to transmit information indicating both the architectures 1A and 3C as usable architectures of the terminal device X to the base station device eNB to which the terminal device X is connected.

(Step S205) The control part 22 determines the architecture which can be used as the only architecture which the base station apparatus eNB of the connection destination of the terminal device X supports among the architectures 1A and 3C. This is because the terminal device X supports both the architectures 1A and 3C, and the base station device eNB to which the terminal device X is connected supports only one of the architectures 1A and 3C. is there. The control unit 22 uses the wireless communication unit 21 to obtain information indicating only one architecture supported by the base station apparatus eNB to which the terminal device X is connected as the architecture that can be used by the terminal apparatus X, and It transmits to the station apparatus eNB.

(Step S206) The control unit 22 has one of the architectures indicated by the support architecture information (architecture information supported by the base station apparatus eNB) notified from the base station apparatus eNB to which the terminal apparatus X is connected; It is determined whether or not the unique architecture indicated by the support architecture information 231 read from the storage unit 23 is equal. As a result of the determination, if they are equal, the process proceeds to step S207, and if not, the process proceeds to step S208.

(Step S207) The control part 22 determines the architecture which can be used as the only architecture which the terminal device X supports among architecture 1A, 3C. This is because the terminal device X supports only one of the architectures 1A and 3C, and the base station device eNB to which the terminal device X is connected supports only one architecture supported by the terminal device X. Because. The control unit 22 uses the wireless communication unit 21 to transmit information indicating only one architecture supported by the terminal device X as an architecture usable by the terminal device X to the base station device eNB to which the terminal device X is connected.

(Step S208) The control unit 22 determines that the terminal device X does not perform dual connectivity with the base station device eNB to which the terminal device X is connected. This is because the terminal device X supports only one of the architectures 1A and 3C, and the base station device eNB to which the terminal device X is connected supports only one architecture supported by the terminal device X. Because it is not. The control unit 22 transmits information indicating that there is no usable architecture of the terminal device X to the base station device eNB to which the terminal device X is connected by the wireless communication unit 21.

  According to the embodiment described above, the base station apparatus eNB can recognize the architecture supported by the terminal apparatus UE connected to itself. Thereby, the effect that it can contribute to performing dual connectivity when there are a plurality of terminal devices UE each supporting different architectures is obtained.

  Further, according to the second embodiment described above, it is possible to selectively use the architecture according to the characteristics of each architecture.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  For example, in the second embodiment described above, the transmission rate is used as information indicating the communication quality of the X2 line, but other information may be used as information indicating the communication quality of the X2 line. As information representing the communication quality of the X2 line, for example, the delay time of the X2 line can be cited. Further, as information representing the communication quality of the X2 line, for example, information representing the communication capability of the X2 line can be cited.

  In the second embodiment described above, the maximum communication quality of the X2 line is used, but other communication quality such as an average communication quality of the X2 line may be used.

  Further, as a place where the base station apparatus eNB stores the base station architecture information 142 of another base station apparatus eNB adjacent to the base station apparatus eNB, for example, an adjacency relation table (Neighbour Relation Table) may be used. The adjacency table holds information related to the base station apparatus eNB adjacent to the base station apparatus eNB in the LTE system. Moreover, you may store the information showing the communication quality of X2 line | wire established between the base station apparatus eNB and the other base station apparatus eNB adjacent to self in an adjacency table.

  Further, in the above-described embodiment, as a method for notifying the base station apparatus eNB of information indicating the architecture supported by the terminal apparatus UE and information on the simultaneous availability of a plurality of architectures, an inquiry about terminal capability information (user equipment capability) However, other methods may be used. For example, the information that the terminal apparatus UE supports in response to an inquiry from the base station apparatus eNB indicates the architecture that the terminal apparatus UE supports in “information indicating the correspondence status of the terminal apparatus UE with respect to the function of the wireless communication system (Feature group indicator)” Information or simultaneous use availability information of multiple architectures may be included and transmitted to the base station apparatus eNB.

  Moreover, although LTE system was mentioned as an example of a radio | wireless communications system in embodiment mentioned above, it is applicable similarly to other radio | wireless communications systems other than an LTE system. For example, in the above-described embodiment, the architecture 3C uses the X2 line, but another line may be used as another architecture.

Moreover, the computer program for implement | achieving the function of the base station apparatus eNB which concerns on embodiment mentioned above, or the terminal device UE is recorded on a computer-readable recording medium, and the program recorded on this recording medium is read into a computer system May be executed. Here, the “computer system” may include an OS and hardware such as peripheral devices.
“Computer-readable recording medium” refers to a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disk), and a built-in computer system. A storage device such as a hard disk.

Further, the “computer-readable recording medium” means a volatile memory (for example, DRAM (Dynamic DRAM) in a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory)), etc., which hold programs for a certain period of time.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 11, 21 ... Wireless communication part, 12 ... Communication part, 13, 22 ... Control part, 14, 23 ... Memory | storage part, 141 ... Support architecture information, 142 ... Base station architecture information, 143 ... Terminal architecture information, 24 ... Input part , 25 ... output unit, 231 ... support architecture information, eNB ... base station apparatus, S-GW ... communication apparatus, UE ... terminal apparatus

Claims (5)

A terminal device that establishes a communication link with a communication device via a base station device,
Among a plurality of architectures that establish a communication link with the terminal device via another base station device while leaving the communication link in one base station device, an architecture supported by the terminal device A wireless communication unit that transmits the support architecture information shown to the base station device,
The wireless communication unit can transmit usable information of an architecture indicating that the terminal device can use a plurality of the architectures simultaneously to the base station device,
A terminal device characterized by that. The support architecture information or the usable information on the architecture is information on the terminal capability transmitted from the own terminal device in response to an inquiry from the base station device, or information indicating the correspondence status of the terminal device with respect to the function of the wireless communication system. , Sent in addition to,
The terminal device according to claim 1. A base station device that relays a communication link established between a communication device and a terminal device;
Of the plurality of architectures that establish a communication link with the terminal device via another base station device while leaving the communication link in one base station device, an architecture supported by the terminal device. A wireless communication unit that receives support architecture information indicating from the terminal device;
A controller that determines usable architecture based on the support architecture information received from the terminal apparatus and the support architecture information indicating the architecture supported by the base station apparatus, and
The wireless communication unit receives architecture availability information indicating that the terminal device can use a plurality of the architectures simultaneously from the terminal device,
The control unit determines an architecture that can be used based on the support architecture information received from the terminal device, the usable information on the architecture, and the support architecture information indicating the architecture supported by the base station device.
A base station apparatus. A method for determining a use architecture of a terminal device for establishing a communication link with a communication device via a base station device,
Of the plurality of architectures in which the terminal device establishes another communication link with the terminal device via another base station device while leaving the communication link in one base station device, the terminal device itself Transmitting support architecture information indicating the architecture supported by the base station apparatus;
The terminal device transmitting architecture usable information indicating that the terminal device can simultaneously use a plurality of the architectures to the base station device;
The base station device determining usable architecture based on the support architecture information received from the terminal device, the usable information of the architecture, and the support architecture information indicating the architecture supported by the base station device;
A method of determining the architecture used. In the computer of the terminal device that establishes a communication link with the communication device via the base station device,
Among a plurality of architectures that establish a communication link with the terminal device via another base station device while leaving the communication link in one base station device, an architecture supported by the terminal device Transmitting the indicated support architecture information to the base station device;
Transmitting the usable information of the architecture indicating that the terminal device can use a plurality of the architectures simultaneously to the base station device;
A computer program for running.

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